// 字符串拼接
const a = 100 +10
const b = 100 + '10'
const b2 = 100 + parseInt('10')
const c = true + '10'
console.log(a, b, b2, c);
// ==运算符
console.log(100 == '100');
console.log(0 == '');
console.log(0 == false);
console.log(false == '');
console.log(null == undefined);